/* ---------- Sidebar ---------- */

.sidebar-rail {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;

  width: var(--sidebar-width-collapsed);

  display: flex;
  flex-direction: column;

  background: var(--bg-void);
  border-right: var(--border-width) solid var(--border-hairline);

  z-index: 30;
  overflow: visible;

  transition: width var(--dur-base) var(--ease-standard);
}

.sidebar-rail--expanded {
  width: var(--sidebar-width-expanded);
}

/* ---------- Header (app name + toggle) ---------- */

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: center;

  flex: 0 0 auto;
  padding: var(--space-1);
  height: var(--header-height);
}

.sidebar-rail--expanded .sidebar-header {
  justify-content: space-between;
  padding-inline: var(--space-3);
}

.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;

  aspect-ratio: 1;
  height: calc(var(--header-height) * 0.7);

  border: var(--border-width-active) solid transparent;
  border-radius: var(--radius-pill);

  background: var(--bg-void);
  color: var(--text-muted);

  cursor: pointer;
  padding: 0;

  transition:
    background var(--dur-base) var(--ease-standard),
    color var(--dur-base) var(--ease-standard),
    border-color var(--dur-base) var(--ease-standard);
}

.sidebar-toggle:hover {
  background: var(--bg-raised);
  color: var(--text-primary);
  border-color: var(--accent-brand);
}

.sidebar-toggle-icon {
  aspect-ratio: 1;
  width: 70%;
  transition: transform var(--dur-base) var(--ease-standard);
}

.sidebar-rail--expanded .sidebar-toggle-icon {
  transform: rotate(180deg);
}

.sidebar-app-combobox {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;

  opacity: 0;
  max-width: 0;
  pointer-events: none;

  transition:
    opacity var(--dur-fast) var(--ease-standard),
    max-width var(--dur-base) var(--ease-standard);
}

.sidebar-rail--expanded .sidebar-app-combobox {
  opacity: 1;
  max-width: 200px;
  pointer-events: auto;
  transition-delay: var(--dur-fast);
}

.sidebar-app-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);

  height: calc(var(--header-height) * 0.6);
  padding: 0 var(--space-2);

  background: var(--bg-panel);
  border: var(--border-width) solid var(--border-hairline);
  border-radius: var(--radius-sm);

  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: var(--font-xs);
  font-weight: var(--font-weight-semibold);

  cursor: pointer;
  transition: border-color var(--dur-base) var(--ease-standard);
}

.sidebar-app-trigger:hover,
.sidebar-app-trigger--open {
  border-color: var(--accent-brand);
}

.sidebar-app-trigger-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-app-trigger-caret {
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform var(--dur-base) var(--ease-standard);
}

.sidebar-app-trigger--open .sidebar-app-trigger-caret {
  transform: rotate(180deg);
}

.sidebar-app-input {
  width: 100%;
  height: calc(var(--header-height) * 0.6);
  padding: 0 var(--space-2);

  background: var(--bg-panel);
  border: var(--border-width) solid var(--accent-brand);
  border-radius: var(--radius-sm);

  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: var(--font-xs);
  font-weight: var(--font-weight-semibold);

  outline: none;
}

.sidebar-app-listbox {
  position: absolute;
  top: calc(100% + var(--space-1));
  left: 0;
  right: 0;
  z-index: 40;

  margin: 0;
  padding: var(--space-1);
  list-style: none;

  background: var(--bg-panel);
  border: var(--border-width) solid var(--border-hairline);
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);

  max-height: 240px;
  overflow-y: auto;
}

.sidebar-app-option {
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--font-xs);
  color: var(--text-primary);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-app-option--highlight {
  background: var(--bg-raised);
}

.sidebar-app-option--selected {
  color: var(--accent-brand);
  font-weight: var(--font-weight-semibold);
}
.sidebar-rail--expanded .sidebar-app-select {
  opacity: 1;
  max-width: 200px;
  padding-inline: var(--space-2);
  pointer-events: auto;
  transition-delay: var(--dur-fast);
}

/* ---------- Scroll ---------- */

.sidebar-scroll {
  flex: 1 1 auto;
  min-height: 0;

  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);

  padding-block: var(--space-1) var(--space-3);
  overflow-y: auto;

  -webkit-mask-image: linear-gradient(to bottom, transparent, black 0);
  mask-image: linear-gradient(to bottom, transparent, black 0);
}

.sidebar-rail--expanded .sidebar-scroll {
  align-items: stretch;
  padding-inline: var(--space-2);
}

.sidebar-scroll[data-fade-top='true'] {
  -webkit-mask-image: linear-gradient(
    to bottom,
    transparent,
    black 24px,
    black calc(100% - 24px),
    black
  );
  mask-image: linear-gradient(to bottom, transparent, black 24px, black calc(100% - 24px), black);
}
.sidebar-scroll[data-fade-bottom='true'] {
  -webkit-mask-image: linear-gradient(to bottom, black, black calc(100% - 24px), transparent);
  mask-image: linear-gradient(to bottom, black, black calc(100% - 24px), transparent);
}
.sidebar-scroll[data-fade-top='true'][data-fade-bottom='true'] {
  -webkit-mask-image: linear-gradient(
    to bottom,
    transparent,
    black 24px,
    black calc(100% - 24px),
    transparent
  );
  mask-image: linear-gradient(
    to bottom,
    transparent,
    black 24px,
    black calc(100% - 24px),
    transparent
  );
}

/* ---------- Item ---------- */

.sidebar-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sidebar-item-gap);

  aspect-ratio: 1;
  height: calc(var(--header-height) * 0.7);

  border: var(--border-width-active) solid transparent;
  border-radius: var(--radius-lg);

  background: transparent;
  color: var(--text-muted);

  cursor: pointer;

  transition:
    background var(--dur-base) var(--ease-standard),
    color var(--dur-base) var(--ease-standard),
    border-color var(--dur-base) var(--ease-standard);
}

.sidebar-item:hover {
  background: var(--bg-raised);
  color: var(--text-primary);
  border: var(--border-width-active) solid var(--accent-brand);
}

.sidebar-item--active {
  border-color: var(--accent-brand);
  color: var(--text-primary);
}

.sidebar-rail--expanded .sidebar-item {
  width: 100%;
  justify-content: flex-start;
  padding-inline: var(--space-2);
}

/* ---------- Icon ---------- */

.sidebar-icon {
  aspect-ratio: 1;
  height: 80%;
  flex-shrink: 0;

  display: flex;
  align-items: center;
  justify-content: center;

  color: currentColor;
}

.sidebar-icon svg {
  width: 100%;
  height: 100%;
  display: block;
  stroke: currentColor;
  fill: none;
}

/* ---------- Label ---------- */

.sidebar-label {
  font-size: var(--font-sm);
  white-space: nowrap;
  overflow: hidden;

  flex: 1 1 auto;
  min-width: 0;

  opacity: 0;
  max-width: 0;

  transition:
    opacity var(--dur-fast) var(--ease-standard),
    max-width var(--dur-base) var(--ease-standard);
}

.sidebar-rail--expanded .sidebar-label {
  opacity: 1;
  max-width: 200px;
}

/* ---------- Content ---------- */

.stage--with-sidebar {
  margin-left: var(--sidebar-width-collapsed);
  transition: margin-left var(--dur-base) var(--ease-standard);
}

.app-root--sidebar-expanded .stage--with-sidebar {
  margin-left: var(--sidebar-width-expanded);
}